BE: Process Images to Video

[ClarkGH]

As an API Endpoint When a Client uploads a list of images to me Then I convert those videos into a new mp4 And Send the video back to the client

• Consider returning a gif as well if it's trivial. If not, pull another issue.
• Follow up to: https://github.com/ClarkGH/shotlify/issues/5

[ClarkGH]

Need to pivot away from the API. ffMPEG is way too heavy on the backend to justify doing this on a SPA. Closing this and the other backend tickets out.

We'll need to consider adding the following before re-opening:

1. Middleware
2. Caching via redis, firestore, celery, AWS lambda, etc.